Abstract: The present invention relates to a method for the cyclical trickle charging of a chargeable battery intended for emergency operation. The charging voltage used for this purpose is the output voltage from a source of d.c. voltage providing a variable level of output voltage. A characteristic feature of the invention is the fact that charging from a starting mode (1) is executed in accordance with a cyclical charging program (10) which is repeated until the battery has been found to be fully charged. A rest mode (13) then occurs during which the battery is not charged, but the battery voltage is measured continuously. The rest mode (13) is interrupted immediately, and the aforementioned charging program (10) is re-started if it is noted in the course of measuring the voltage that the battery voltage has dropped below a first pre-determined value.

Abstract: This invention relates to a method for recharging a chargeable battery for a motor vehicle, a machine, a motor boat or the like. As the charging voltage there is used the output voltage from a charging generator which is connected to the battery, the output voltage being varied by controlling the field of the generator. The charging takes place by means of repeated charging cycles each of which consists of a charging period and a test period when the battery is loaded and the charging from the generator to the battery is disconnected. The value of the charging voltage during a charging period is determined on the basis of the test result during the immediately preceding test period. According to the invention the battery voltage is compared to a pre-determined voltage during each test period.